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Softcover – 340 pages – Yamaha YZ100 YZ125 YZ175 YZ250 YZ400 YZ465 YZ490 Monoshock 1976 – 1984 Clymer Owners Service Repair Manual Covers the following Models: Yamaha YZ100 1976-1983 Yamaha YZ125 1976-1984 Yamaha YZ175 1976 Yamaha YZ250 1976-1984 Yamaha YZ400 1976-1979 Yamaha YZ465 1980-1981 Yamaha YZ490 1982-1984Contents: QUICK REFERENCE DATA GENERAL INFORMATIONManual organization / Service hints / Torque specifications / Safety first / Special tips / Mechanic #39;s tips / Parts replacement / Expendable supplies / Tools / What year is it? / Serial numbers / Specifications TROUBLESHOOTINGOperating requirements / Troubleshooting instruments / Emergency troubleshooting / Engine starting / Engine performance / Engine noises / Excessive vibration / Two-stroke pressure test / Front suspension and steering / Brake problems / Specifications LUBRICATION MAINTENANCE AND TUNE-UPPre-checks / Tyres and wheels / Lubricants / Cleaning solvent / Periodic lubrication / Engine lubrication / Transmission oil checking and changing / Front fork oil change / Front fork air pressure / Periodic maintenance / Monoshock adjustment / Drive chain adjustment / Clutch adjustment / Throttle adjustment / Air cleaner service / Engine tune-up / Cylinder head nuts torque / Spark plug / Magneto / Ignition timing / Idle speed adjustment / Decarbonizing engine and exhaust system / Storage / Specifications ENGINEEngine principles / Engine lubrication / Engine cooling / Servicing engine in frame / Engine / Cylinder head / Cylinder / Piston piston pin and piston rings / Magneto / Reed valve assembly / Crankcase and crankshaft / Kickstarter / Service and adjustment / Specifications CLUTCH AND TRANSMISSIONClutch / Clutch cable / Clutch release (push lever) mechanism / External shift mechanism / Transmission and internal shift mechanism / Specifications FUEL AND EXHAUST SYSTEMSAir cleaner / Carburetor operation / Carburetor service / Carburetor adjustments / Fuel shutoff valve / Fuel tank / Fuel filter / Exhaust system / Exhaust system decarbonizing / Exhaust system repair / Specifications ELECTRICAL SYSTEMCapacitor discharge ignition / Spark plug / Magneto-outer rotor (type I) / Magneto-inner rotor (type II III IV) / Ignition coil / Engine kill switch / Specifications FRONT SUSPENSION AND STEERINGFront wheel / Front hub / Wheels / Tyre changing / Tyre repairs / Handlebar / Steering head / Front fo more tips


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If if this is spinning from idle to any components than the ignition return hose to force away and the radiator.